JP2012097675A - Intake system of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake system of an internal combustion engine, capable of introducing the uniform amount of gas and uniform heat of gas into the respective cylinders, as a result of which hermeticity of an intake manifold is less likey to be impaired.SOLUTION: The intake system of an internal combustion engine includes: an intake manifold 1; and a cartridge 2 provided in the intake manifold, the cartridge having a plurality of intake channels 4 for supplying air to the respective cylinders in the internal combustion engine and valve elements 9 configured to adjust the amounts of intake air taken into the respective cylinders. The system also includes a gas supply portion 3 configured to introduce gas discharged from the internal combustion engine into the cylinders, and disposed at a center position of the cartridge in the direction of a row of the plurality of intake channels. The cartridge is provided with gas distribution channels 13 extending from the gas supply portion to the plurality of intake channels.

Description

  The present invention includes an intake manifold, a plurality of intake passages that are provided in the intake manifold and supply air to the respective cylinders of the internal combustion engine, and a valve body that adjusts the intake air amount of the air sucked into the respective cylinders. And a gas supply part that introduces gas emitted from the internal combustion engine into the cylinder, and the gas distribution to the cartridge from the gas supply part to each of the plurality of intake passages The present invention relates to an intake device for an internal combustion engine provided with a passage.

In the above-described intake device for an internal combustion engine, conventionally, the gas supply unit is provided at a portion of one end side in the arrangement direction of the plurality of intake passages (hereinafter referred to as the passage arrangement direction) of the cartridge.
The cartridge is provided with a gas introduction path for introducing the gas (exhaust gas) supplied from the gas supply section to a central position in the passage arrangement direction of the cartridge, and an end position of the gas introduction path is provided at the end of the gas introduction path. A gas distribution path reaching each of the intake passages arranged on the left and right sides with respect to each other is connected (see, for example, Patent Document 1).

JP 2005-307960 A

For this reason, the gas supplied from the gas supply section sequentially passes through the gas introduction path and the gas distribution path while radiating heat to the cartridge.
However, since the gas introduction path is provided only in the portion (hereinafter referred to as the supply portion side portion) extending from the side of the gas supply portion of the cartridge to the central position in the passage alignment direction, The temperature rises in comparison with the portion on the side where the gas introduction path is not provided, that is, the portion extending between the other end side and the central position in the passage arrangement direction of the cartridge (hereinafter referred to as the non-supplying portion side portion). easy.
As a result, the difference between the temperature distribution in the supply portion side portion and the temperature distribution in the non-supply portion side portion becomes large and the cartridge is likely to be thermally distorted, which may impair the airtightness of the intake manifold.
Further, the temperature of the air passing through the intake passage provided in the supply portion side portion is more likely to rise than the air passing through the intake passage provided in the non-supply portion side portion. There may be a difference.
The present invention has been made in view of the above circumstances, and it is possible to uniformly introduce the amount of gas introduced and the heat of the gas into each cylinder, and the airtightness of the intake manifold is less likely to be impaired. It is an object of the present invention to provide an air intake device.

  A first characteristic configuration of an intake device for an internal combustion engine according to the present invention is an intake manifold, a plurality of intake passages which are provided in the intake manifold and supply air to the respective cylinders of the internal combustion engine, and are sucked into the respective cylinders. A gas supply unit that introduces gas emitted from the internal combustion engine into the cylinder, in the arrangement direction of the plurality of intake passages of the cartridge. In addition to being provided at the center position, the cartridge is provided with a gas distribution path from the gas supply unit to each of the plurality of intake passages.

In the intake device for an internal combustion engine having this configuration, the gas supply unit is provided at a central position in the arrangement direction of the plurality of intake passages in the cartridge.
For this reason, since the gas supplied from the gas supply unit can be introduced into each cylinder from the central position of the cartridge, the gas can be uniformly introduced into each cylinder. Therefore, the amount of gas introduced and the heat of the gas can be uniformly introduced into each cylinder.
Even if the heat of the gas acts on the cartridge, it acts evenly from the center position of the cartridge toward the left and right intake passages, so that the airtightness of the intake manifold may be impaired even if the cartridge is subject to thermal distortion Can be reduced.

  According to a second characteristic configuration of the present invention, an opening is formed in each wall surface of the plurality of intake passages as an end portion of the gas distribution passage, and at any position of the gas distribution passage from the gas supply portion to the opening. With respect to the longitudinal direction of the cartridge, the gas distribution path is provided with a gradient so as not to recede toward the gas supply unit.

For example, when gas is circulated through the gas distribution path in a state where the temperature of the cylinder is not sufficiently increased, moisture contained in the gas is easily cooled and condensed in the gas distribution path.
With this configuration, a downward gradient can be provided over the entire length of the gas distribution path.
Therefore, the condensed water can surely flow down to the outlet of the gas distribution passage and be discharged to the intake passage.
Therefore, if it is an intake device of the internal combustion engine of this composition, it will be in the state where the moisture (condensed water) contained in gas cannot be collected, and a gas distribution channel can always be kept clean.

  A third characteristic configuration of the present invention is that the cartridge is made of a resin material having heat resistance more than that of the resin material constituting the intake manifold.

The heat of the engine is transmitted to the intake manifold, but it is not so hot because it is cooled by the intake air flowing inside. Therefore, the intake manifold can be made of a more general-purpose resin material. On the other hand, a cartridge provided with a gas distribution path that mainly distributes and supplies gas is always kept at a high temperature. However, the cost of the resin material increases as functions are added, such as providing the intake manifold and the cartridge with high heat resistance.
Therefore, as in this configuration, the manufacturing cost of the intake device can be reduced by configuring only the cartridge with a resin material having heat resistance rather than the resin material configuring the intake manifold.

It is a disassembled perspective view of the intake device of an internal combustion engine. It is a perspective view of the intake device of an internal combustion engine. It is the III-III sectional view taken on the line of FIG. It is the front view which looked at the intake manifold from the cartridge side. It is the VV sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the intake passage which shows 2nd Embodiment. It is a longitudinal cross-sectional view of the intake passage which shows 3rd Embodiment. It is a longitudinal cross-sectional view of the intake passage which shows 4th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 5 show an intake device for an internal combustion engine according to the present invention, specifically, an intake manifold of an automobile four-cylinder gasoline engine.
The intake manifold is assembled between a throttle body (not shown) and an intake port of an engine cylinder head.

  As shown in FIGS. 1 and 2, the intake manifold is a resin intake manifold 1 and a cartridge 2 joined to an intake port connection surface of a cylinder head (not shown), and is made of a resin provided in the intake manifold 1. A cartridge 2 and an exhaust gas supply unit 3 that circulates exhaust gas as an example of gas emitted from the engine to each cylinder in the engine are provided.

In the cartridge 2, a plurality (four in this embodiment) of intake passages 4 for supplying air (intake air) in the intake manifold 1 to respective cylinders in the engine are formed so as to be arranged in a substantially horizontal direction.
The intake manifold 1 is made of a heat resistant resin material such as 6 nylon or 66 nylon. The cartridge 2 is made of a high heat-resistant resin material such as polyphenylene sulfide resin (PPS) or aromatic nylon (PPA) having higher heat resistance than the resin material constituting the intake manifold 1.

The intake manifold 1 is provided with a throttle body mounting portion 5 and a cartridge mounting opening 6 into which the cartridge 2 is inserted and mounted so as to face each other.
The intake manifold 1 is formed in a substantially bilaterally symmetrical shape with respect to the center line X of the throttle body mounting portion 5 such that the lateral width increases toward the cartridge mounting opening 6 side.
The cartridge mounting opening 6 is formed in a horizontally long symmetrical shape.

  The upper wall portion 1a of the intake manifold 1 is provided with a blow-by gas introduction part 7 to which a blow-by gas introduction pipe is connected and an exhaust gas introduction part 8 to which an exhaust gas introduction pipe from the engine is connected. The blow-by gas introduction part 7 and the exhaust gas introduction part 8 are arranged along the center line X.

  As shown in FIGS. 4 and 5, the cartridge 2 includes an outer peripheral wall 2 a joined to the inner peripheral surface along the cartridge mounting opening 6 of the intake manifold 1 and four intake passages 4 inside the outer peripheral wall 2 a. It has a horizontally long shape having three partition walls 2b for partitioning, and is formed symmetrically.

At the center position in the longitudinal direction of the passage inside each intake passage 4, a valve body 9 for adjusting the intake amount of air sucked into each cylinder in the engine passes through each partition wall 2b, and both ends of the outer peripheral wall 2a. Is supported by a support shaft 9a.
The opening degree of each valve element 9 is adjusted by driving the electric motor 10.

As shown in FIGS. 3 and 4, the cartridge 2 is formed with a port joint surface 11 that is joined to a suction port connection surface of a cylinder head (not shown) with a gasket 11a interposed therebetween, and the port joint surface 11 faces outward. The cartridge 2 is inserted into the cartridge mounting opening 6.
The port joint surface 11 is formed by outward facing surfaces of the outer peripheral wall 2a and the partition wall 2b.
In the present embodiment, the cartridge 2 is not welded to the intake manifold 1, but may be welded to the intake manifold 1 by a method such as ultrasonic welding.

As shown in FIGS. 3 and 5, the exhaust gas introduction part 8 is configured by providing a metal short pipe 12 having a connection flange 12 a to which an exhaust gas introduction pipe (not shown) is connected.
The exhaust gas supply unit 3 supplies the exhaust gas introduced into the exhaust gas introduction unit 8 from the short pipes 12 so as to circulate to the respective cylinders, and is located at a central position in the arrangement direction of the plurality of intake passages 4 in the cartridge 2. It is provided.

The cartridge 2 is provided with an exhaust gas distribution passage 13 extending from the exhaust gas supply unit 3 to each of the plurality of intake passages 4.
As shown in FIG. 5, the exhaust gas distribution path 13 includes a first distribution path 13a provided to bifurcate symmetrically on the upper outer peripheral wall 14 of the outer peripheral wall 2a of the cartridge 2, and a cartridge as shown in FIG. Two partition walls 15 partitioning the adjacent intake passages 4 at two longitudinal ends
And (2b) each having a second distribution path 13b.
Two second distribution passages 13b are provided for each partition wall 15 in order to communicate with each of the intake passages 4 on both sides of the partition wall 15.

The first distribution path 13a is bifurcated symmetrically downward from the exhaust gas supply unit 3, and two second distribution paths 13b are communicated with the end portions of the first distribution path 13a.
As shown in FIGS. 3 and 4, the first distribution path 13 a includes a first distribution path forming groove 17 formed on the upper end surface 16 facing the intake manifold side of the upper outer peripheral wall 14, and the first distribution path forming groove 17. Is formed between the upper end face 16 and the resin plate 18 joined by ultrasonic welding.
The second distribution path 13b is formed between a second distribution path forming groove 19 formed on the port joint surface 11 along the vertical direction and an intake port connection surface of a cylinder head (not shown) joined to the port joint surface 11. It is formed.

  The short pipe 12 for introducing the exhaust gas is inserted into a through hole formed in the upper wall portion 1a of the intake manifold 1 so as to communicate with the left and right central positions of the first distribution path forming groove 17, and the first distribution path It communicates with the formation groove 17.

Corresponding to each of the left and right end portions of the first distribution path forming groove 17, a communication hole 20 that connects the first distribution path forming groove 17 and the two second distribution path forming grooves 19 is formed through the cartridge 2. ing.
Therefore, the cartridge 2 is provided with an exhaust gas distribution path 13 extending from the exhaust gas supply unit 3 to each of the plurality of intake passages 4, and an opening 21 is formed on each wall surface of the plurality of intake passages 4 as an end portion of the exhaust gas distribution path 13. Is formed.

The first distribution path forming groove 17 is branched from the exhaust gas supply unit 3 along the direction of slanting left and right along the cartridge longitudinal direction and downward.
The two second distribution path forming grooves 19 formed along the downward direction corresponding to the left and right end portions of the first distribution path forming groove 17 are formed obliquely downward from the middle of the first distribution path forming groove 17, respectively. The two distribution passage forming grooves 19 are opened in the wall surface of one intake passage 4 sandwiching the partition wall 15, and the other second distribution passage forming groove 19 is opened in the wall surface of the other intake passage 4 sandwiching the partition wall 15. Is formed.

Therefore, at any position of the exhaust gas distribution path 13 from the exhaust gas supply unit 3 to each intake passage 4, the exhaust gas distribution path 13 is more than the line segment based on the line segment along the longitudinal direction of the cartridge 2 at that position. A gradient is provided so as not to retreat to the exhaust gas supply unit 3 side, that is, the upstream side in the exhaust gas supply direction.
By providing such a gradient, the water cooled and condensed in the exhaust gas distribution path 13 can surely flow down to the terminal opening 21 of the exhaust gas distribution path 13 and can be discharged into the intake passage 4.

[Second Embodiment]
FIG. 6 is a longitudinal sectional view of the intake passage 4 showing another embodiment.
In the present embodiment, a resin plate 18 that is joined to the upper end surface 16 of the cartridge 2 and forms the first distribution path 13 a between the first distribution path forming groove 17 and the intake manifold 1 is integrally formed.

Further, the intake passage 4 is formed so as to protrude from the upper end face 16 toward the intake manifold 1 so as to enter the inside of the intake manifold 1 greatly.
Therefore, the duct length of the intake passage 4 can be extended by extending the intake passage 4 to the inside of the intake manifold 1, and the inertia supercharging effect when the engine is rotating at a low speed can be enhanced.

The shape of the end face 4a facing the intake manifold 1 side of the cartridge portion surrounding the intake passage 4 is formed in a trumpet shape in which the diameter of the intake passage 4 increases toward the inlet side.
Other configurations are the same as those of the first embodiment.

[Third Embodiment]
FIG. 7 is a longitudinal sectional view of the intake passage 4 showing another embodiment.
In the present embodiment, as in the second embodiment, the resin plate 18 that is joined to the upper end surface 16 of the cartridge 2 and forms the first distribution path 13 a between the first distribution path formation groove 17 is provided in the intake manifold 1. It is integrally molded.

In addition, a cylindrical intake passage member 22 is attached to the cartridge portion surrounding the intake passage 4 so as to be retractable toward and away from the intake manifold 1 so that the length of the intake passage 4 can be expanded and contracted.
The shape of the end face 22a facing the intake manifold 1 side of the intake passage member 22 is formed in a trumpet shape in which the diameter of the intake passage 4 increases toward the inlet side.

According to the present embodiment, for example, the length of the intake passage 4 is increased when the accelerator pedal is depressed at a low rotation speed, and the length of the intake passage 4 is decreased at a high rotation speed when the depression amount is large. It is possible to control so that the inertia supercharging effect can be obtained even when the engine is at a low speed or at a high speed.
Other configurations are the same as those of the first embodiment.

[Fourth Embodiment]
FIG. 8 is a longitudinal sectional view of the intake passage 4 showing another embodiment.
In the present embodiment, as in the second embodiment, the resin plate 18 that is joined to the upper end surface 16 of the cartridge 2 and forms the first distribution path 13 a between the first distribution path formation groove 17 is provided in the intake manifold 1. It is integrally molded.

Further, by connecting the cartridge portion surrounding the intake passage 4 to the end face 4a facing the intake manifold 1 side, the shaping member 23 which shapes the inlet shape of the intake passage 4 into a trumpet shape whose diameter increases toward the inlet side. It is integrally formed with the manifold 1.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
In the intake device for an internal combustion engine according to the present invention, a hole forming an exhaust gas distribution path may be formed in the cartridge.

In the first to fourth embodiments, the cartridge 2 is built in the intake manifold 1. With such a configuration, the cartridge 2 can be assembled to the cylinder head after being assembled to the intake manifold 1 in advance.
Therefore, assembling is facilitated as compared with the case where the cartridge 2 is interposed between the intake manifold 1 and the cylinder head.

In the first to fourth embodiments, the blow-by gas is introduced into the blow-by gas introduction unit 7 and the exhaust gas is introduced into the exhaust gas introduction unit 8, but the exhaust gas is introduced into the blow-by gas introduction unit 7 instead of the blow-by gas, and the exhaust gas is introduced. A configuration in which blow-by gas is introduced into the portion 8 instead of exhaust gas may be employed.
Alternatively, the blow-by gas and the exhaust gas may be introduced into the exhaust gas introduction unit 8 and the blow-by gas introduction unit 7 may not be provided.
Further, as the gas introduced into the blow-by gas introduction unit 7 and the exhaust gas introduction unit 8, a gas other than the blow-by gas and the exhaust gas (for example, an evaporation gas in the fuel tank) may be introduced.

DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Cartridge 3 Gas supply part 4 Intake passage 9 Valve body 13 Gas distribution path 21 Opening (terminal part of gas distribution path)

Claims (3)

An intake manifold,
A plurality of intake passages provided in the intake manifold for supplying air to the respective cylinders of the internal combustion engine and a cartridge having a valve body for adjusting an intake amount of the air taken into the respective cylinders;
A gas supply part for introducing the gas discharged from the internal combustion engine into the cylinder is provided at a central position in the arrangement direction of the plurality of intake passages of the cartridge, and the cartridge is provided with the gas supply part from the gas supply part. An intake device for an internal combustion engine, which is provided with a gas distribution passage leading to each of a plurality of intake passages. An opening is formed in each wall surface of the plurality of intake passages as an end portion of the gas distribution path,
At any position of the gas distribution path from the gas supply section to the opening, a gradient is provided so that the gas distribution path does not retreat toward the gas supply section with respect to the longitudinal direction of the cartridge. Item 2. An intake device for an internal combustion engine according to Item 1.   The intake device for an internal combustion engine according to claim 1 or 2, wherein the cartridge is made of a resin material having a heat resistance higher than that of the resin material constituting the intake manifold.

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